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Real-time holographic heterodyne spatial filtering
Author(s): Jed Khoury
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Paper Abstract

Traditionally, homodyne and heterodyne detection is a combination of a frequency mixer followed by a low-pass filter. Mixing two signals of frequencies f1 and f2, generates sum and difference frequencies signals and their integer multiples. Both multiplication heterodyne and phase sensitive detection have been demonstrated optically by using photorefractive, four-wave mixing [FWM). The multiplicative characteristic of FWM was used for mixing, and the response time of the photorefractive medium is used for low-pass filtering. If one of the input beams is both spatially and temporally modulated using a wobbling rotating mirror, depending on which mode is heterodyned, one can generate an orthogonal set of Bessel band-pass filters. This scheme can be integrated part within parallel data acquisition systems for applications involved nondestructive testing.

Paper Details

Date Published: 30 April 2018
PDF: 8 pages
Proc. SPIE 10649, Pattern Recognition and Tracking XXIX, 106490V (30 April 2018); doi: 10.1117/12.2304785
Show Author Affiliations
Jed Khoury, Lartec, Inc. (United States)


Published in SPIE Proceedings Vol. 10649:
Pattern Recognition and Tracking XXIX
Mohammad S. Alam, Editor(s)

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